File Release Notes and Changelog

Release Notes

- configure now bails with an error message if presented with a request to build against PostgreSQL 7.3
- Renamed event source name (win32)
- Failover and move set ACCEPT_SET vents communicate specific event numbers so that if these are submitted multiple times in near succession nodes do not get confused by reading an already-processed ACCEPT_SET.
- Added back man page sections that were missing on several OSes
- Fix to bug #1572 - some log shipping related queries got submitted to a regular node. Use separate variables so that the logshipping-specific queries are in their own namespace, never to touch regular nodes.